On Mon, Mar 22, 2010 at 11:45:21PM +0530, anshul gangwar wrote:

hello,

    I want to know whether BAT ids are fixed.

BAT ids are fixed for the life-time of a BAT, i.e., on creation, a BAT is assigned an ID, which is keeps unchanged and exclusively until the BAT is destroyed, again.

If fixed then what does that BAT_select_(b=tmpr_2322): BATslice(v=tmp_2403, low=0, high=1) means?

This means that a range (or point) selection on a tail-sorted BAT is executed by looking up the positions of the lower and higher bound of the range (using binary search) and then getting the complete result as a positional slice of the BAT between these two positions. See MonetDB/src/gdk/gdk_batop.(mx|c) for details. Stefan ps: Please note that the information you get about the runtime algorithm/implementaion choice (using --debug=$[2*1024*1204]) is mainly meant for core developers of MonetDB when analysing and debugging the system; hence, it is (a) not guaranteed to be complete and (b) makes only sense in case you know and understand the code in MonetDB/src/gdk/ quite well ...

The INTERNET now has a personality. YOURS! See your Yahoo! Homepage. http://in.yahoo.com/

------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev

_______________________________________________ Monetdb-developers mailing list Monetdb-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/monetdb-developers

-- | Dr. Stefan Manegold | mailto:Stefan.Manegold@cwi.nl | | CWI, P.O.Box 94079 | http://www.cwi.nl/~manegold/ | | 1090 GB Amsterdam | Tel.: +31 (20) 592-4212 | | The Netherlands | Fax : +31 (20) 592-4199 |